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@uiten gieten iatut @meer GEORGE W.. GRADER AND MATTHIAS H. BALDWIN, OF MEMPHIS,

TENNESSEE.

Leiters .Patent No. 64,094, dated April 23, 1867 IMPEOVED .STREET PAVEMENT.

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TOvALL WHOM IT MAY CONCERN:

Be it known that we, GEORGE W. GRADER and MATTHIAS H. BALDWrN, of Memphis, Shelby county, Tennessee, have invented a new and improved Street- Pavement; and we do hereby declare that the following is afull, clear, and exact description thereof, which will enable othersskilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification. I

The object of this invention is to construct a pavement which is stronger and cheaper than any other now in use, and in which no depressions and uneven parts can be formed, as is the case with those now in use.

The invention consists in the use of a cast-iron framework, which is arranged so as to form a number oi' square or polygonal cells, in which cells wooden blocks are arranged. These blocks project above the iron frameA work, so that the latter does not come into direct contact with the vehicles, Svc., and is consequently not so easily worn. The-wood when worn can be easily removed and replaced 'by new blocks. In the annexed drawing our invention is illustrated- Figure 1 being a cross-section 'of a street, which is provided with our improved pavement.

Figure 2 is a top view of some of the iron framework.

Figure 3 is a sectional view of part of the complete pavement; and

Figure 4 is a perspective view of the latter.

Similar letters of reference indicate corresponding parts. l

A is n cast-iron framework, so made as to form square or polygonal cells a a, int-o which wooden blocks B oi corresponding shape are inserted, said blocks resting o n ilanges b b formed at the bottom of the cells, (see iig. 3.) The framework isformed in sections, as shown, which sections can be interlocked in such a manner that no one section can settle or get out of line as long as it or the surrounding sections are not broken. For this purpose projecting anges c are formed on every alternate corner of each section, fitting into a recess, d, under the corner in the opposite section, so that these anges alternately completely interlock the diiferent sections. The wooden blocks B are or may be made tapering at the top, and the spaces thus left between them 'lled with tar and gravel, or with any other suitable material. But, if desired, the blockcan be sovarranged 'that no or almost no spaces are left between them. The blocks can be easily removed from the frame A, and

replaced,vif desired.

We claim as new, as far as our invention is non' perfected Interlocking the sections ofthe frame A, by means of the protecting iianges e on every alterniate corner of each section, tting into a recess b under the corner of the opposite' section, thereby preventing the pavement from settling or getting out of line, as herein shown and described. i

The above specification of our invention signed by us this day of 1867.

' GEORGE W. GRADER,

M. H. BALDWIN.

Witnesses:

W. R. HUNT, T. C. BIrTIs. 

